Stockholders' Equity And Stock-Based Compensation (Stock Repurchase) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016	Jul. 25, 2018	Jan. 25, 2017	Oct. 31, 2014	Feb. 29, 2012	Jul. 31, 2011	Jul. 31, 2010	Nov. 30, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount	$ 1,650,000				$ 1,650,000									$ 250,000
Shares repurchased (in shares)	912,822	896,689	77,705	493,884	2,381,100
Cost	$ 59,990	$ 55,480	$ 5,001	$ 29,999	$ 150,470	$ 100,000	$ 100,854
Average Price Paid per Share (in dollars per share)	$ 65.71	$ 61.86	$ 64.33	$ 60.73	$ 65.71
Additional Stock Approved [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount								$ 350,000	$ 200,000	$ 200,000	$ 100,000	$ 250,000	$ 300,000